| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.store.raw.xact.NoLocking |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.store.raw.xact; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.locks.Latch; |
| 24 | |
| 25 | import org.apache.derby.iapi.store.raw.LockingPolicy; |
| 26 | import org.apache.derby.iapi.store.raw.ContainerHandle; |
| 27 | import org.apache.derby.iapi.store.raw.RecordHandle; |
| 28 | import org.apache.derby.iapi.store.raw.Transaction; |
| 29 | |
| 30 | import org.apache.derby.iapi.error.StandardException; |
| 31 | |
| 32 | |
| 33 | /** |
| 34 | A locking policy that implements no locking. |
| 35 | |
| 36 | @see LockingPolicy |
| 37 | */ |
| 38 | class NoLocking implements LockingPolicy { |
| 39 | |
| 40 | protected NoLocking() { |
| 41 | } |
| 42 | |
| 43 | public boolean lockContainer( |
| 44 | Transaction t, |
| 45 | ContainerHandle container, |
| 46 | boolean waitForLock, |
| 47 | boolean forUpdate) |
| 48 | throws StandardException { |
| 49 | return true; |
| 50 | } |
| 51 | |
| 52 | public void unlockContainer( |
| 53 | Transaction t, |
| 54 | ContainerHandle container) |
| 55 | { |
| 56 | } |
| 57 | |
| 58 | public boolean lockRecordForRead( |
| 59 | Transaction t, |
| 60 | ContainerHandle container, |
| 61 | RecordHandle record, |
| 62 | boolean waitForLock, |
| 63 | boolean forUpdate) |
| 64 | throws StandardException |
| 65 | { |
| 66 | return true; |
| 67 | } |
| 68 | |
| 69 | public void lockRecordForRead( |
| 70 | Latch latch, |
| 71 | RecordHandle record, |
| 72 | boolean forUpdate) |
| 73 | throws StandardException |
| 74 | { |
| 75 | } |
| 76 | |
| 77 | public boolean zeroDurationLockRecordForWrite( |
| 78 | Transaction t, |
| 79 | RecordHandle record, |
| 80 | boolean lockForPreviousKey, |
| 81 | boolean waitForLock) |
| 82 | throws StandardException |
| 83 | { |
| 84 | return true; |
| 85 | } |
| 86 | |
| 87 | public boolean lockRecordForWrite( |
| 88 | Transaction t, |
| 89 | RecordHandle record, |
| 90 | boolean lockForInsert, |
| 91 | boolean waitForLock) |
| 92 | throws StandardException |
| 93 | { |
| 94 | return true; |
| 95 | } |
| 96 | |
| 97 | public void lockRecordForWrite( |
| 98 | Latch latch, |
| 99 | RecordHandle record) |
| 100 | throws StandardException |
| 101 | { |
| 102 | } |
| 103 | |
| 104 | public void unlockRecordAfterRead( |
| 105 | Transaction t, |
| 106 | ContainerHandle container, |
| 107 | RecordHandle record, |
| 108 | boolean forUpdate, |
| 109 | boolean row_qualified) |
| 110 | throws StandardException |
| 111 | { |
| 112 | } |
| 113 | |
| 114 | public int getMode() { |
| 115 | return LockingPolicy.MODE_NONE; |
| 116 | } |
| 117 | |
| 118 | } |